The Optolong L-Pro 2″ Mounted Filter is a versatile light pollution filter ideal for both astrophotography and visual astronomy. Engineered to reduce transmission of artificial light from sources like mercury vapor and sodium lamps, this filter dramatically enhances contrast and color balance when observing or imaging from urban environments.

Its selective passbands permit key emissionssuch as H-alpha, H-beta, OIII, NII, and SIIwhile suppressing unwanted skyglow and artificial interference. Whether youre capturing wide-field nebulae or zooming in on star clusters, the Optolong L-Pro ensures a vivid, balanced view that preserves natural star colors and fine nebular structure. Its high-quality glass and precision coatings make it a reliable tool for serious observers and imagers alike.

• Filter Type: UV/IR/Luminance
• Filter Size: 50.8 mm (2″)
• Shape: Round
• Insert Style: Threaded (M48 x 0.75)
• Glass Type: Schott B260 optical substrate
• Coating Technology: Electron-beam gun evaporation with Ion-assisted deposition
• Surface Quality: 60/40
• Transmission: Optimized for OIII (496/500nm), H-beta (486nm), NII (654/658nm), H-alpha (656nm), and SII (672nm)
• Use Case: Visual observing and astrophotography in light polluted ski